Today a circuit will be built using an LM3915IC and it will visually represent the intensity of an audio signal.

The LM3915 has an amplitude of 30 dB and the 10 LEDs are activated in 3 dB intervals.

If you want to have an even larger scale can pair several LM3915. See the datasheet on how to do it. You can additionally use the LM3914 and LM3916 that having the same footprint have different results - the first is a linear display and the second a VU Meter between -20 and 3 dB.

Social

Your browser does not support JavaScript!Your browser does not support JavaScript!Your browser does not support JavaScript!Your browser does not support JavaScript!Your browser does not support JavaScript!